AP Environmental Science Exam Practice Questions & Answers 100% Correct

A fuel's net energy yield is correctly defined as - Answer a comparison between the cost of mining, processing, and transporting a fuel and the amount of useful energy the fuel generates A regular light bulb has an efficiency rating of 3 percent. For every 1 joule of energy that bulb uses, the amount of energy produced is - Answer 0.03 joules of light Methane gas and ethanol are two examples of biogases that are produced in what process? - Answer The anaerobic digestion of biomass Hybrid car engines have what motor? - Answer Gasoline and electric powered engines What are ways to increase energy efficiency? - Answer using low volume shower spray heads; insulating your home thoroughly; switching incandescent light bulbs to fluorescent bulbs; increasing fuel efficiency of vehicles; A typical coal-burning power plant uses 4,500 tons of coal per day. Each pound of coal produces 5,000 BTUs of electrical energy. How many BTUs are produced each day from this plant? - Answer 4.5 X 10^10 What produces the least amount of carbon dioxide while generating electricity? - Answer Wind turbines How much energy, in kWh, is used by a 100 wat computer running for 5 hours? - Answer 0.5 kWh Photovoltaic cells produce electricity by - Answer using the sun's energy to create a flow of electrons in a material such as silicon A sample of radioactive material has a half-life of 20 years. It has an activity of 2 curies. How many years does it take for the material to have an activity level of .25 curies? - Answer 60 years The term vampire appliances correctly refers to appliances that - Answer consume electricity even when they are not operating